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Postoperative IOP changes after 20-gauge vitrectomy and 23-gauge transconjunctival sutureless vitrectomy. Error bars indicate 95% confidence interval. *IOP change, calculated by postoperative IOP minus preoperative IOP, was compared between the two gauges and the change was statistically significant only at postoperative 1 day (P<0.001 by Student's t-test).
